Experiences

Roles, contributions, and knowledge areas organized chronologically.

Frontend Engineer

Aug 2024 - Apr 2025 / Napier Labs

Product / Project: Modular DeFi protocol on EVM enabling permission-less yield tokenization and fixed-yield trading
Contributions: Built the Napier V2 web frontend from scratch, largely on my own.
Supported the protocol’s growth, helping total value locked (TVL) scale from $0 to $40 million+.
Tech Stack: TypeScript, Next.js, Tailwind, Wagmi, Viem, GraphQL, Zod, Neverthrow, Vercel, Sentry, Figma
Knowledge: Yield tokenization
Fixed yield mechanics
DeFi UX patterns
Smart contract interactions

Fullstack Engineer

Mar 2023 - Jul 2024 / Salon Brain Inc.

Product / Project: CRM platform for beauty salons using LINE to automate customer engagement and improve retention
Contributions: Built both the frontend and backend of the Salon Brain platform almost entirely on my own from scratch.
Supported MVP validation and helped scale the service from zero to 100+ contracted salons.
Tech Stack: TypeScript, Next.js, Tailwind, React Firebase Hooks, LIFF, Express, Firebase
Knowledge: Multi-tenant architecture
MVP development and validation
CRM strategy for beauty salons

Tech Researcher

Apr 2021 - Oct 2023 / SoftBank Corp.

Product / Project: Conducted technical research and validation to formulate and plan enterprise Web3 strategy
Contributions: Investigated the technical mechanisms of Uniswap, contract wallets, account abstraction, etc.
Developed POC prototypes for ticket and stamp rally NFTs for real-world implementation.
Considered wallet-centered Web3 strategies and regularly reported findings to senior stakeholders.
Tech Stack: Solidity, TheGraph, IPFS, Chainlink, TypeScript, React, Express, Amplify, AWS
Knowledge: Web3 fundamental architecture
Web3 business strategy in Web2 enterprises

Technical PM

Jun 2017 - Mar 2022 / SoftBank Corp.

Product / Project: Gateway connecting the TBCASoft consortium blockchain (HIVEX) and legacy payment systems
Contributions: Coordinated system design and interface specifications with internal and external engineers.
Managed development schedules and cross-team tasks, taking external partners into account.
Tech Stack: Java, Spring Boot, PostgreSQL, Docker, AWS
Knowledge: Payment system architecture
Blockchain interoperability
Cross-company engineering coordination

Team/Tech Lead

Jun 2017 - Oct 2019 / SB Innoventure Corp.

Product / Project: Mobile app that auto-tags and organizes screenshots to support brainstorming and task reminders
Contributions: Took on the challenge of 0-to-1 consumer business creation as the team and technical leader.
Tech Stack: JavaScript, React, Python, Firebase
Knowledge: Lean startup
Solution-product fit exploration
Agile development
Team management

Frontend Engineer

Aug 2024 - Apr 2025 / Napier Labs

Product / Project

Modular DeFi protocol on EVM enabling permission-less yield tokenization and fixed-yield trading

Contributions

Built the Napier V2 web frontend from scratch, largely on my own.
Supported the protocol’s growth, helping total value locked (TVL) scale from $0 to $40 million+.

Tech Stack

TypeScript, Next.js, Tailwind, Wagmi, Viem, GraphQL, Zod, Neverthrow, Vercel, Sentry, Figma

Knowledge

Yield tokenization
Fixed yield mechanics
DeFi UX patterns
Smart contract interactions

Fullstack Engineer

Mar 2023 - Jul 2024 / Salon Brain Inc.

Product / Project

CRM platform for beauty salons using LINE to automate customer engagement and improve retention

Contributions

Built both the frontend and backend of the Salon Brain platform almost entirely on my own from scratch.
Supported MVP validation and helped scale the service from zero to 100+ contracted salons.

Tech Stack

TypeScript, Next.js, Tailwind, React Firebase Hooks, LIFF, Express, Firebase

Knowledge

Multi-tenant architecture
MVP development and validation
CRM strategy for beauty salons

Tech Researcher

Apr 2021 - Oct 2023 / SoftBank Corp.

Product / Project

Conducted technical research and validation to formulate and plan enterprise Web3 strategy

Contributions

Investigated the technical mechanisms of Uniswap, contract wallets, account abstraction, etc.
Developed POC prototypes for ticket and stamp rally NFTs for real-world implementation.
Considered wallet-centered Web3 strategies and regularly reported findings to senior stakeholders.

Tech Stack

Solidity, TheGraph, IPFS, Chainlink, TypeScript, React, Express, Amplify, AWS

Knowledge

Web3 fundamental architecture
Web3 business strategy in Web2 enterprises

Technical PM

Jun 2017 - Mar 2022 / SoftBank Corp.

Product / Project

Gateway connecting the TBCASoft consortium blockchain (HIVEX) and legacy payment systems

Contributions

Coordinated system design and interface specifications with internal and external engineers.
Managed development schedules and cross-team tasks, taking external partners into account.

Tech Stack

Java, Spring Boot, PostgreSQL, Docker, AWS

Knowledge

Payment system architecture
Blockchain interoperability
Cross-company engineering coordination

Team/Tech Lead

Jun 2017 - Oct 2019 / SB Innoventure Corp.

Product / Project

Mobile app that auto-tags and organizes screenshots to support brainstorming and task reminders

Contributions

Took on the challenge of 0-to-1 consumer business creation as the team and technical leader.

Tech Stack

JavaScript, React, Python, Firebase

Knowledge

Lean startup
Solution-product fit exploration
Agile development
Team management